The Knot Grass (Acronicta rumicis) is a moth of the family Noctuidae. It is distributed through the Palearctic - Europe, Western North Africa, through Iraq, Iran, Afghanistan, Ural mountains through Siberia, Russian Far East, Mongolia, northern China, Central Asia to Korea and Japan. In Europe lacking only in some areas of North-Western Scandinavia, Northern Scandinavia and Northern Russia. South in the Lebanon, Syria, Israel, Jordan, Cyprus, Caucasus. Also in North-Western India. The adults fly at night from May to July . They are attracted to light.